React Native - How to start another animation conditionally - react-native

Question

I want to create my own loader using animation, my idea is using scale to handle it, so the step should be like:
show an image scale from (n) to 1 for the first time
check if conditional is accepted or not
if conditional accepted, show an image scale from 1 to (n)
I can achieve 1st condition, but when i try 2nd and 3rd condition, the animation start in a blink of eye,
anyone can help me how to fix this?
here's the code i've tried:
//animation function
playAnimation(){
this.setState({onLoad:true})
this._load.setValue(0)
this._scale.setValue(0)
Animated.timing(this._load, {
toValue: 100,
useNativeDriver: true,
duration:1000
}).start(()=>{
setTimeout(() => {
Animated.timing(this._scale, {
toValue: 100,
useNativeDriver: true,
duration:1000
}).start(()=>this.setState({onLoad:false}));
}, 2000);
});
onLoad = this._load.interpolate({
inputRange: [0, 50, 75, 100],
outputRange: [10, 1, 1.4, 1],
})
imageScale = this._scale.interpolate({
inputRange: [20, 35, 70],
outputRange: [1.2, 1, 20],
})
}
//on render
<Animated.Image
style={{
resizeMode:'contain',
position:'absolute',
zIndex:1,
width:width/2,
height:200,
transform:[{scale:this.state.onLoad?onLoad:imageScale}]
}}
source={{uri: "https://www.knittedhome.com/communities/5/004/012/872/235/images/4628207884.jpg"}}
/>
and the result:

Answer 1

How your code works right now is somewhere in your code, you're calling PlayAnimation().
PlayAnimation() will:
start and complete first animation
Wait 2 sec
start and complete second animation
What you're doing in your Animated.Image is setting the transforms to different values. This doesn't start or stop the animation, just tells Animated.Image what value to set transform to.
What you should do
Use one Animated.Value to keep track of the scale. Assign that value to the Animated.Image transform.
Write two Animation functions:
scaleDown, call this where you're currently calling PlayAnimation
scaleUp, use your onLoad conditional to execute this in render or somewhere appropriate.